WO2000021153A1 - Ensemble pile a combustible permettant une meilleure gestion du fluide de service et une plus grande flexibilite de conception - Google Patents

Ensemble pile a combustible permettant une meilleure gestion du fluide de service et une plus grande flexibilite de conception Download PDF

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Publication number
WO2000021153A1
WO2000021153A1 PCT/US1999/023283 US9923283W WO0021153A1 WO 2000021153 A1 WO2000021153 A1 WO 2000021153A1 US 9923283 W US9923283 W US 9923283W WO 0021153 A1 WO0021153 A1 WO 0021153A1
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WO
WIPO (PCT)
Prior art keywords
manifold
plate
face
aperture
fluid
Prior art date
Application number
PCT/US1999/023283
Other languages
English (en)
Inventor
Russel H. Marvin
Charles H. Carlstrom, Jr.
Original Assignee
Plug Power, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plug Power, Inc. filed Critical Plug Power, Inc.
Priority to DE19983649T priority Critical patent/DE19983649T1/de
Priority to CA002346395A priority patent/CA2346395A1/fr
Priority to AU65097/99A priority patent/AU6509799A/en
Priority to JP2000575180A priority patent/JP2002527862A/ja
Publication of WO2000021153A1 publication Critical patent/WO2000021153A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • This invention relates, generally, to fuel cell assemblies and, more particularly, to fluid service as well as fluid flow plate configuration and positioning for fuel cell assemblies.
  • Fuel cells electrochemically convert fuels and oxidants to electricity, and fuel cells can be categorized according to the type of electrolyte (e.g., solid oxide, molten carbonate, alkaline, phosphoric acid, or solid polymer) used to accommodate ion transfer during operation. Moreover, fuel cell assemblies can be employed in many environments, for multiple applications.
  • electrolyte e.g., solid oxide, molten carbonate, alkaline, phosphoric acid, or solid polymer
  • a Proton Exchange Membrane (hereinafter "PEM”) fuel cell converts the chemical energy of fuels such as hydrogen and oxidants such as air/oxygen directly into electrical energy.
  • the PEM is a solid polymer electrolyte that permits the passage of protons (i.e., H + ions) from the "anode” side of a fuel cell to the "cathode” side of the fuel cell while preventing passage therethrough of reactant fluids (e.g., hydrogen and air/oxygen gases).
  • protons i.e., H + ions
  • reactant fluids e.g., hydrogen and air/oxygen gases.
  • an individual PEM-type fuel cell has multiple, generally transversely extending layers assembled in a longitudinal direction.
  • all layers which extend to the periphery of the fuel cells have holes therethrough for alignment and formation of fluid manifolds that generally service fluids for the stack.
  • some of the fluid manifolds distribute fuel (e.g., hydrogen) and oxidant (e.g., air/oxygen) to, and remove unused fuel and oxidant as well as product water from, fluid flow plates which serve as flow field plates for each fuel cell.
  • oxidant e.g., air/oxygen
  • other fluid manifolds circulate coolant (e.g., water) for cooling.
  • coolant e.g., water
  • the fuel cell does not generate any product water in that area because the electrochemical reaction there stops. Undesirably, this drying out can progressively march across the PEM until the fuel cell fails completely. So, the fuel and oxidant fed to each fuel cell are usually humidified. Furthermore, a cooling mechanism is commonly employed for removal of heat generated during operation of the fuel cells.
  • Flow field plates are commonly produced by any of a variety of processes.
  • One plate construction technique which may be referred to as "monolithic” style, compresses carbon powder into a coherent mass.
  • the coherent mass is subjected to high temperature processes which bind the carbon particles together, and convert a portion of the mass into graphite for improved electrical conductivity.
  • the mass is cut into slices, which are formed into the flow field plates.
  • each flow field plate is subjected to a sealing process (e.g., resin impregnation) in order to decrease gas permeation therethrough and reduce the risk of uncontrolled reactions.
  • a sealing process e.g., resin impregnation
  • flow field channels are engraved or milled into a face of the rigid, resin-impregnated graphite plate.
  • a bridge or cover plate can extend along the face of a fluid flow plate and across the inlets thereof, defining one opening or injection port for each inlet in addition to an input orifice to a fluid manifold.
  • the inlets can receive respective portions of a given stream of reactant fluid for the fuel cell.
  • Each injection port can inject a portion of liquid water directly into its respective flow channel in order to mix its respective portion of liquid water with the corresponding portion of the stream. This serves to hydrate at least corresponding parts of a given membrane of the corresponding fuel cell.
  • the hydration system may be augmented by a metering system, including flow regulators. Each flow regulator can meter an injecting of liquid portions at the plate inlets into a given fluid stream.
  • the bridge or cover plate may be interposed between a gasket and the fluid flow plate, at the inlets thereof.
  • an insufficient clamping of the membrane electrode assembly may allow flapping thereof in the presence of pressurized reactant fluid flow, which may cause leakage of the reactant fluid at the plate inlets to an opposite side of the fuel cell, with deleterious consequences (e.g., explosion).
  • a fuel cell assembly unit in one aspect of the invention, includes a first plate and a second plate.
  • the first plate includes a first face and a second face.
  • the first face comprises a flow field face which includes a flow channel thereon.
  • the first plate includes an aperture forming a manifold portion of a manifold for conducting a fluid for a fuel cell assembly.
  • the flow field face includes a formation thereon serving to impede fluid communication on the flow field face between the flow channel and the aperture.
  • the first plate includes an opening extending between the flow channel and the second face.
  • the second plate includes a third face.
  • the third face includes a surface portion forming a passage portion of a flow path between the manifold and the opening.
  • the formation can serve to provide a seal with a membrane electrode assembly portion.
  • the formation can include a gasketing material portion and/or be adapted to serve as a gasketing material portion.
  • the formation can serve to provide a seal with a gasketing material portion.
  • the formation can resemble a step and/or include a peak.
  • a fuel cell assembly unit in yet another aspect of the present invention, includes a first plate and a second plate.
  • the first plate includes a first flow field face which includes a first flow channel thereon.
  • the first plate includes a first aperture forming a first manifold portion of a first manifold for conducting a type of reactant fluid for a fuel cell assembly.
  • a first longitudinal axis of the fuel cell assembly passes through a first port for the first plate.
  • the first port is in fluid communication with the first flow channel and the first manifold.
  • the second plate includes a second flow field face which includes a second flow channel thereon.
  • the second plate includes a second aperture and a third aperture.
  • the second aperture forms a second manifold portion of the first manifold.
  • the third aperture forms a third manifold portion of a second manifold for conducting the type of reactant fluid.
  • a second longitudinal axis of the fuel cell assembly passes through a second port for the second plate.
  • the second port is in fluid communication with the second flow channel and the second manifold.
  • the second plate is formed without a port having the first longitudinal axis pass therethrough and in fluid communication with the second flow channel and the first manifold and/or the second manifold.
  • the first manifold and the second manifold can comprise a same manifold.
  • the second aperture and the third aperture can comprise a same aperture.
  • the first aperture can form a fourth manifold portion of the second manifold.
  • the invention further contemplates a method suitable for fuel cell assembly flow field fluid service.
  • a first plate is selected to have a first face and second face.
  • the first face comprises a flow field face which includes a flow field channel thereon.
  • the second face comprises an exterior face.
  • the first plate includes an opening extending between the flow field channel and the exterior face.
  • a second plate is selected to have a third face.
  • the third face includes a surface portion thereon.
  • a fluid portion is conducted along a flow path between a manifold and the flow field channel.
  • the flow path includes the surface portion and the opening.
  • the present invention advantageously provides enhanced fluid service for a fuel cell assembly. Further, the invention provides improved configurations for formation of fluid flow plates. Also, coordination and cooperation among fluid flow plates provide geometric features. In addition, there is provided improved sealing of a membrane electrode assembly portion. Metering of humidification fluid is also enabled. Furthermore, a decreased number of components and an easier assembly for a fuel cell stack are included in the present invention.
  • FIG. 1 is a sectional, elevation, side view of one example of a fuel cell assembly incorporating and using the fluid service and design flexibility capabilities of the present invention
  • FIG. 2 is a plan view of an outer face of one example of a fluid flow plate of the fuel cell assembly of FIG. 1 ;
  • FIG. 3 is a cutaway, sectional, partial, side representation of fluid flow plates serving as flow field plates in a fuel cell of the fuel cell assembly of FIG. 1;
  • FIG. 4 is a cutaway, sectional, partial, side representation of a flow path between a manifold and a flow channel on a fluid flow face, illustrating the flow path as employing a bridge plate between the fluid flow face and a gasket
  • FIG. 5 is a cutaway, sectional, partial, side representation of a flow path between a manifold and a flow channel on a fluid flow face of a fluid flow plate, illustrating the flow path passing along an adjacent fluid flow plate and through an opening in communication with the flow channel;
  • FIG. 6 is a view similar to FIG. 5, further illustrating a peripheral portion of the fluid flow plate providing a gasketing function by interfacing with a membrane electrode assembly portion;
  • FIG. 7 is an enlarged cutaway, partial, side, sectional representation of an exemplary configuration for the peripheral portion of the fluid flow plate of FIG. 6;
  • FIG. 8 is a cutaway, partial, perspective view of one side of a fluid flow plate, illustrating inlet ports between manifolds and flow channels;
  • FIG. 9 is a cutaway, partial, perspective view of an opposite side of the fluid flow plate of FIG. 8;
  • FIG. 10 is a cutaway, partial, perspective representation of the fluid flow plate of FIG. 8 and a second fluid flow plate having cooperating surfaces and configurations for providing fluid service, illustrating inlet ports between manifolds and flow channels;
  • FIG. 11 is a plan view of an outer face of one example of a fluid flow plate having multiplied fluid manifolds extending therethrough;
  • FIG. 12 is a plan view of an opposite outer face of the fluid flow plate of FIG. 11;
  • FIG. 13 is a perspective representation of multiple instances of the fluid flow plate of FIG. 12, illustrating an exemplary relative positioning of the fluid flow plates for providing an exemplary use of the manifolds and surfaces;
  • FIG. 14 is a cutaway, partial, perspective view of one side of the fluid flow plate of FIG. 8, illustrating an outlet port between a manifold and flow channels;
  • FIG. 15 is a cutaway, partial, perspective view of an opposite side of the fluid flow plate of FIG. 14;
  • FIG. 16 is a cutaway, partial, perspective representation of the fluid flow plates of FIG. 10, illustrating outlet ports between a manifold and flow channels.
  • a fuel cell assembly in which surfaces of multiple fluid flow plates (e.g., flow field plates) are employed in providing fluid service as well as enhancing support in the fuel cell assembly, in addition to increasing design flexibility therefor and easing formation thereof.
  • An example of a fuel cell assembly incorporating and using the novel features of the present invention is depicted in FIG. 1 and described in detail herein.
  • a fuel cell assembly 100 includes end plates 102 and 104, insulation layers 106 and 108, and current collector/conductor plates 110 and 112, with a working section 114 therebetween.
  • the working section includes one or more active sections and can include a selected number of cooling sections, as will be understood by those skilled in the art. In one aspect, the one or more active sections can further serve to perform cooling for the fuel cell assembly.
  • a number of structural members 116, such as tie-bolt(s), can be employed to join the end plates.
  • Working section 114 includes a number of layers 118.
  • the layers generally form fluid manifolds 150 for supplying fluids to, removing fluids from, and otherwise communicating and/or servicing fluids as desired within the working section, as will be appreciated by those skilled in the art.
  • the layers of fuel cell assembly 100 might have applied thereto compressive pressure and/or stress which is approximately equivalent to, preferably, fifty to one thousand pounds per square inch, and, most preferably, two hundred to four hundred pounds per square inch.
  • a plurality of layers 118 form one or more (e.g., one hundred and eight) PEM-type fuel cells 300 (FIG. 3).
  • PEM-type fuel cells 300 FIG. 3
  • the construction and utilization of PEM fuel cells is known in the art.
  • FIG. 2 One example of a layer 118 of working section 1 14 is depicted in FIG. 2 as fluid flow plate 200.
  • the plate has a fluid flow face 202 with one or more, for instance, substantially parallel and/or generally serpentine, flow channel(s) 204 thereon.
  • the flow channels receive and transmit one or more fluids through ports 206 and 208 which are in fluid communication with corresponding fluid manifolds 150 and 150'.
  • flow channel(s) 204 through formation of solid sidewalls in fluid flow face 202, may have any preselected configuration(s), such as for providing and/or ensuring maximal, even, continuous, appropriate, desired and/or uniform fluid service and/or coverage for active area(s) of membrane electrode assembly 310 (FIG. 3).
  • land(s) 314, 314' (FIG. 3) may separate adjacent flow channel sections.
  • a given fluid flow plate 200 may be a bipolar, monopolar, combined monopolar (e.g., anode cooler or cathode cooler), or cooling plate.
  • the fluid flow plate serves as a flow field plate and flow channels 204 conduct fluid which includes reactant fluid for fuel cell assembly 100.
  • the reactant fluid serves as fuel or oxidant for a given fuel cell 300 (FIG. 3).
  • the flow channels can carry reactant gas (e.g., a fuel such as hydrogen or an oxidant such as air/oxygen) as well as vapor and/or liquid (e.g., humidification and/or product water), as will be understood by those skilled in the art.
  • fluid flow plate 200 has a number of (e.g., peripheral) holes 210 therethrough.
  • a number of the holes 210 may cooperate in formation of fluid manifolds, such as fluid manifolds 150, of fuel cell assembly 100.
  • the perimeters of layers 118 are formed with minimal amounts of material disposed generally transversely beyond the active extent of working section 114 as well as the fluid manifolds of the fuel cell assembly, as represented in FIG. 2.
  • the fluid flow plate may be formed with a material such as non-magnetic, austenitic stainless steel.
  • a material such as titanium may be employed.
  • fluid flow plate 200 may be formed in accordance with the principles of U.S. Application Serial No. 09/054,670 by Carlstrom (entitled "Easily-Formable Fuel Cell Assembly Fluid Flow Plate Having
  • the fluid flow plate may include conductive, non-conductive, injection-moldable and compliant portions.
  • the fluid flow plate may include hole(s) 801 (FIGS. 8-10 and 14- 20) for receiving structural members 116 (FIG. 1) therethrough.
  • gasketing material or gaskets 304, 304' may be employed to seal peripheral holes 210 (FIG. 2), and may cooperate with other portions of layers 118 in formation of the fluid manifolds.
  • a given gasket 304, 304' might take the form of, for instance, a frame gasket made from a polytetrafluoroethylene ("PTFE") material manufactured by E. I. DuPont de Nemours Company and sold under the trademark TEFLON®.
  • PTFE polytetrafluoroethylene
  • O-ring gasket(s) might be employed.
  • FIG. 3 depicts fuel cell 300 with fluid flow plates 200 and 200' serving as flow field plates.
  • flow field plate 200 might serve as an anode side of the fuel cell
  • flow field plate 200' might serve as a cathode side of the fuel cell
  • face 202 might comprise an anode face
  • face 202' might comprise a cathode face
  • flow channels 204 might carry hydrogen, as fuel, and humidification water (vapor and/or liquid).
  • flow channels 204' might carry air/oxygen, as oxidant, as well as humidification water (vapor and/or liquid) and/or product water (vapor and/or liquid), as will be understood by those skilled in the art.
  • Fuel cell 300 includes membrane or solid electrolyte 306.
  • the solid electrolyte 306 comprises a solid polymer electrolyte made using a polymer such as a material manufactured by E. I. DuPont de Nemours Company and sold under the trademark NAFION®.
  • an active electrolyte such as sulfonic acid groups might be included in this polymer.
  • the solid polymer electrolyte might be formed with a product manufactured by W.L. Gore & Associates (Elkton, MD) and sold under the trademark GORE-SELECT®.
  • catalysts 308 and 308' e.g., platinum
  • which facilitate chemical reactions are applied to the anode and cathode sides, respectively, of the solid polymer electrolyte.
  • MEA membrane electrode assembly
  • the MEA might be formed with a product manufactured by W.L. Gore & Associates and sold under the trade designation PRJ-MEA 5510-HS.
  • MEA 310 is sandwiched between anode and cathode gas diffusion layers (hereinafter “GDLs”) 312 and 312', respectively, which may be formed with a resilient and conductive material such as carbon fabric, carbon fiber paper, carbon cloth or carbon paper.
  • GDLs cathode gas diffusion layers
  • GDL gas diffusion layer
  • porous carbon cloth or paper is infused with a slurry of carbon black and sintered with TEFLON® material.
  • the anode and cathode GDLs serve as electrochemical conductors between corresponding catalyzed sites of solid polymer electrolyte 306 and the fuel (e.g., hydrogen) and oxidant (e.g., air/oxygen) which each flow in anode and cathode flow channels 204 and 204', respectively.
  • the GDLs also present to the surfaces of MEA 310 a combination of microscopic porosity and macroscopic porosity.
  • Microscopic porosity allows reactant gas molecules to pass generally longitudinally from the flow channels to a surface of the MEA. Macroscopic porosity allows product water formed at the cathode surface of the MEA to be removed therefrom by flowing generally longitudinally into the cathode flow channels, to prevent flooding of the catalyst particles.
  • deionized water might be added to a given reactant gas stream conducted by flow channel(s) 204, 204'.
  • the water would desirably serve to humidify membrane 306.
  • humidification of reactant fluid may occur in accordance with the principles of the above- incorporated International Publication No. WO 99/05740.
  • a reactant fluid (e.g., gas) stream may be humidified in any of a variety of ways, as will be understood by those skilled in the art.
  • the land(s) 314, 314' may be formed, for instance, with a material such as non-magnetic, austenitic stainless steel. In another example, a material such as titanium may be employed. Additional description of possible electrical contact positions is provided in the above-incorporated U.S. Application Serial No. 09/054,670.
  • GDL 312 is located between lands 314 and (e.g., catalyst 308) the anode side of MEA 310, and GDL 312' is located between the lands 314' and (e.g., catalyst 308') the cathode side of the MEA.
  • bridge or cover plate 402 may be employed between gasket 304 and flow channels) 204.
  • An exemplary configuration for such a bridge or cover plate is disclosed in the above-incorporated International Publication No. WO 99/05740.
  • the bridge or cover plate may serve to maintain open and unclogged certain port(s) 206 between manifold 150 and the flow channels, such as for flow path 401.
  • the bridge or cover plate may serve to prevent intrusion of the gasket into the ports (e.g., under compression of fuel cell assembly 100).
  • bridge or cover plate 402 may serve to cooperate with opposite gasket 304' and opposite plate 200' in maintaining a clamping or sealing pressure on MEA 310, thereby advantageously preventing unwanted leakage or seeping of, for instance, reactant fluid in a fuel cell.
  • bridge or cover plate 402 requires manufacturing of the same, as well as careful positioning thereof during assembly of fuel cell stack 100. In one aspect, it may be desirable to eliminate expense and/or effort associated with and/or attributable to the separate part or piece of the bridge or cover plate, through a configuration which nevertheless provides the advantageous functions of the bridge or cover plate.
  • port 206 may provide fluid communication between flow channel(s) 204 on fluid flow face 202 and fluid manifold 150 by employing opening 858 between the fluid flow face 202 and backside face 504.
  • the port may comprise flow path 501 between the manifold and the flow channel employing, for instance, first surface 506 on the backside face, second surface 508 on additional fluid flow plate 510, third surface 512 on additional gasket 514, and/or other surface(s).
  • fluid flow face 202 may include formation 516 serving, in one aspect, to impede and/or prevent fluid communication on the fluid flow face 202 directly from manifold 150, past gasket 304, and to flow channel(s) 204.
  • the formation may further serve to abut the gasket 304 and maintain sealing or clamping pressure for MEA 310 against and/or with opposite gasket 304' in abutment with opposite face 202' of opposite fluid flow plate 200', such as for preventing undesired leakage.
  • the formation may resemble a step.
  • the formation may serve to eliminate need for a separate bridge or cover plate or piece, and advantageously reduce the number of parts in fuel cell stack 100, thereby easing manufacturing and assembling thereof.
  • port 206 may be considered to be an inlet port, where those skilled in the art will appreciate how description herein of such an inlet port may apply and/or be extended and/or modified to apply to certain aspects of an outlet port (e.g., one may for illustrative purposes consider port 208 of FIG. 2 to be such an outlet port).
  • formation 516 may provide a gasketing function.
  • the formation may directly seal with MEA 310.
  • the formation may comprise feature(s) of fluid flow plate 200 formed in accordance with the principles of the above-incorporated U.S. Application No. 09/054,670.
  • the formation may comprise physical and/or geometric feature(s) of non-conductive, compliant, and/or injection- molded material(s).
  • the formation may include peak(s) 518, such as for enhancing sealing with the MEA.
  • port(s) 206 as including reactant inlet port 802 and humidification inlet port 804 is now described with reference to FIGS. 8- 9.
  • fluid flow plate 200 may include aperture(s) 850 and/or 852 extending therethrough.
  • the aperture 850 may form a portion of reactant fluid manifold 854.
  • the reactant fluid manifold may carry reactant fluid for a number of fuel cells 300 of fuel cell assembly 100.
  • the aperture 852 may form a portion of humidification fluid manifold 856.
  • the humidification fluid manifold may carry humidification fluid to be added to the reactant fluid provided through the reactant fluid manifold, such as for humidification of MEA 310.
  • the reactant fluid may comprise a fuel such as hydrogen or an oxidant such as air/oxygen.
  • the humidification fluid may comprise a liquid such as deionized water.
  • fluid flow plate 200 may include opening(s) 858 and/or opening(s) 860.
  • the opening 858 may participate in communication of reactant fluid between reactant fluid manifold 854 and flow channel(s) 204.
  • the openings 860 may participate in communication of humidification fluid between humidification fluid manifold 856 and the flow channels 204.
  • fluid flow plate 200 may include formation(s) 862 and/or 864.
  • the formation 862 may be located between reactant fluid manifold 854 and opening 858.
  • the formation 864 may be located between humidification fluid manifold 856 and opening(s) 860.
  • formation 862 may resemble a step on fluid flow face 202 serving to impede and/or prevent fluid communication between reactant fluid manifold 854, directly on the fluid flow face 202, and into flow channel (s) 204.
  • reactant fluid may be communicated between the reactant fluid manifold and the flow channels by passing on surface(s) between the flow channels and the reactant fluid manifold, including surface(s) not located on the fluid flow face 202. For instance, a flow path between the reactant fluid manifold and the flow channels may pass along surface 506 of face 504.
  • the formation 862 may include passage(s) 866 for participating in fluid flow between the reactant fluid manifold 854 and opening 858.
  • the formation 862 may include rib(s) 868 between instances of the passages 866.
  • formation 864 may resemble a step on fluid flow face 202 serving to impede and/or prevent fluid communication on the fluid flow face directly between humidification fluid manifold 856 and flow channel(s) 204. Further, the formation 864 may on face 504 include passage(s) 870 between the humidification fluid manifold and opening(s) 860.
  • the openings 860 may resemble flow regulators and/or metering orifices such as are disclosed in the above-incorporated International Publication No. WO 99/05740. For instance, the openings 860 may serve to atomize humidification liquid to be added to reactant fluid flow streams in the flow channels 204. In one aspect, referring to FIGS.
  • formation(s) 862 and/or 864 may serve to obviate the previous need(s) for bridge or cover plate(s) or piece(s).
  • the step(s), optionally including peak(s) 518, for fluid flow face 202 may serve to provide sealing and/or clamping surface(s) with layer(s) 118 such as portion(s) of gasket(s) 304 and/or MEA(s) 310.
  • flow path(s) on and/or adjacent to face 504 may serve to eliminate need for separate bridge or cover plate(s) or/or piece(s), while providing fluid communication between flow channel(s) 204 and reactant fluid manifold 854 and/or humidification fluid manifold 856.
  • port(s) 802 may include a plurality of openings 858 extending through fluid flow plate 200, analogously to the exemplary depiction in FIG. 9 of a plurality of openings 860 illustratively comprising port(s) 804.
  • FIGS. 8-10 and 14-16 illustrate exemplary cooperating configuration(s) among fluid flow plates 200 and 510.
  • fluid flow plates 200 and 510 in an exemplary configuration, include similar feature(s), some of which are aligned and others of which are offset, to provide cooperating surface(s), as described herein.
  • a number of features of fluid flow plate 200 have already been described in detail above, and similar features of fluid flow plate 510 are now described.
  • port(s) 206 may include reactant inlet port 1802 and humidification inlet port 1804, which may be analogous to ports 802 and 804, respectively.
  • fluid flow plate 510 may include aperture(s) 1850 and/or 1852 extending therethrough.
  • the aperture 1850 may form a portion of reactant fluid manifold 854.
  • the aperture 1852 may form a portion of humidification fluid manifold 856.
  • the fluid flow plate 510 may include opening(s) 1858, and/or opening(s) comparable to opening(s) 860 (FIG. 9).
  • the opening 1858 may participate in communication of reactant fluid between the reactant fluid manifold 854 and flow channel(s) 1204.
  • the above-mentioned openings analogous to the openings 860 may participate in communication of humidification fluid between the humidification fluid manifold 856 and the flow channels 1204.
  • fluid flow plate 510 may include formation(s)
  • fluid flow plate 200 may include aperture 850 forming a portion of reactant fluid manifold 854.
  • Fluid flow plate 510 may include aperture 1850 forming another portion of the same reactant fluid manifold 854.
  • the apertures 850 and 1850 may have a first longitudinal axis of fuel cell assembly 100 passing therethrough.
  • the apertures 850 and 1850 may include portions thereof at locations sharing same approximate transverse offset(s) with respect to a certain longitudinal axis of the fuel cell assembly.
  • port 802 for fluid flow plate 200 may provide fluid communication between reactant fluid manifold 854 and flow channel(s) 204 on fluid flow face 202.
  • port 1802 may provide fluid communication between the reactant fluid manifold 854 and flow channel(s) 1204 on face 1202 of fluid flow plate 510.
  • the ports 802 and 1802 have different longitudinal axes of fuel cell assembly 100 passing therethrough.
  • opening 858 of the fluid flow plate 200 and surface 508 of fluid flow plate 510 have a same longitudinal axis of the fuel cell assembly passing therethrough.
  • fluid flow face 202 may include surface 1508.
  • the surface 1508 and opening 1858 of plate 510 in one example, have a same longitudinal axis of the fuel cell assembly passing therethrough.
  • various instance(s) of surface 1508 may participate in providing fluid communication between reactant fluid manifold 854 and flow channel(s) 1204, similarly to the above-described exemplary function provided by surface 508 between the reactant fluid manifold and the flow channels 204, as will be appreciated by those skilled in the art.
  • fluid flow plate 510 has port 1802 located so a longitudinal axis of fuel cell assembly 100 passing through the port 1802 passes through surface 1508 of fluid flow face 202, but does not pass through port 802 of the fluid flow face 202.
  • the fluid flow plate 200 has the port 802 located so a longitudinal axis of the fuel cell assembly passing therethrough also passes through surface 508 of fluid flow face 1202, but does not pass through the port 1802. That is, the present invention includes selected alignment(s) and unalignment(s). Therefore, the surface 508 may participate in providing fluid communication between reactant fluid manifold 854 and flow channels 204 without interfering with reactant fluid communication between the reactant fluid manifold and flow channels 1204, as described herein. Similarly, interference with humidification fluid service may be avoided.
  • formation 862 may cooperate with surface 508 in providing a mechanism allowing reactant fluid communication between reactant fluid manifold 854 and flow channels 204, in addition to providing for MEA 310 clamping and/or sealing previously provided through an additional bridge or cover plate or piece.
  • Comparable advantage(s) may be provided through positioning of formation 1862 between the reactant fluid manifold and flow channels 1204, as well as coordination with a particular instance of surface 1508 (e.g., located on an instance of fluid flow plate 200 positioned behind fluid flow plate 510), as will be appreciated by those skilled in the art.
  • surface 1508 e.g., located on an instance of fluid flow plate 200 positioned behind fluid flow plate 510
  • fluid flow plate 510 may include surface 2508 having a longitudinal axis of fuel cell assembly 100 passing therethrough, which longitudinal axis may also pass through port 804 for fluid communication between humidification fluid manifold 856 and flow channel(s) 204.
  • the surface 2508 may participate in providing flow path(s) between the humidification fluid manifold and the flow channels 204, in cooperation with formation 864, as described herein.
  • fluid flow plate 510 may have port 1804 providing fluid communication between the humidification fluid manifold and flow channel(s) 1204, located so a longitudinal axis of the fuel cell assembly, different from the above-mentioned longitudinal axis passing through port 804 and surface 2508, passes through the port 1804 and surface 3508 of fluid flow face 202.
  • an instance of surface 3508 located on an instance of fluid flow plate 200 positioned behind fluid flow plate 510 may cooperate with formation 1864 in providing a flow path between humidification fluid manifold 856 and flow channels 1204, while obviating the previous need for a bridge or cover plate or piece, as described herein.
  • port 802 may exemplify an inlet port between reactant fluid manifold 854 and flow channel(s) 204
  • port 1802 may exemplify an inlet port between the reactant fluid manifold and flow channel(s) 1204.
  • port 804 may serve to illustrate an inlet port between humidification fluid manifold 856 and the flow channels 204
  • port 1804 may serve to illustrate an inlet port between the humidification fluid manifold and the flow channels 1204.
  • certain ports may be provided as outlet ports.
  • fluid flow plate 1100 includes multiple apertures serving to form respective portions of corresponding fluid manifolds for fuel cell assembly 100. It is understood that various feature(s) of fluid flow plate 1100 may allow and/or be modified to allow numerous uses. For illustrative purposes, a specific application of the fluid flow plate 1100 is now presented.
  • fluid flow plate 1100 includes aperture 1102 forming a portion of an entrance fuel manifold 1104 lacking a port for face 1106 or face 1108 between the entrance fuel manifold 1104 and flow channel area 1110 on fluid flow face 1106 or flow channel area 1112 on fluid flow face 1108.
  • the fluid flow plate 1100 includes aperture 1114 forming a portion of entrance fuel manifold 1116 in fluid communication with port(s) 1118, providing fluid communication between the flow channel area 1110 on the fluid flow face 1106 and the entrance fuel manifold 1116.
  • the fluid flow plate 1100 includes aperture 1120 forming a portion of exit fuel manifold 1122 lacking a port between the same and the flow channel area 1110 or the flow channel area 1112.
  • the fluid flow plate 1100 includes aperture 1124 forming a portion of exit fuel manifold 1126 in fluid communication with port 1128, providing fluid communication between the flow channel area 1110 and the exit fuel manifold 1126.
  • fluid flow plate 1 100 includes aperture 1130 forming a portion of entrance oxidant manifold 1132 lacking a port providing fluid communication between the same and flow channel area 1110 or flow channel 1112.
  • Aperture 1134 forms a portion of entrance oxidant manifold 1136 in fluid communication with port 1138, providing fluid communication between flow channel area 1112 and the entrance oxidant manifold 1136.
  • Aperture 1140 forms a portion of exit oxidant manifold 1142 lacking a port between the same and the flow channel area 1110 or the flow channel area 1112.
  • Aperture 1144 forms a portion of exit oxidant manifold 1146 in fluid communication with port 1148, providing fluid communication between flow channel area 1112 and the exit oxidant manifold 1146.
  • aperture 1150 forms a portion of humidification fluid manifold 1152.
  • the humidification fluid manifold 1152 is in fluid communication with port 1154, providing fluid communication between the humidification fluid manifold 1152 and port 1118, in fluid communication with flow channel area 1110.
  • the humidification fluid manifold 1152 is in fluid communication with port 1156, which is in fluid communication with port 1138 providing fluid communication with flow channel area 1112.
  • Aperture 1158 forms a portion of humidification fluid manifold 1160 lacking a port providing fluid communication between the humidification fluid manifold 1158 and the flow channel area 1110 or the flow channel area 1112.
  • fuel and humidification fluid may enter flow channel area 1110 from port 1118, and exit the flow channel area 1110 through port 1128.
  • oxidant and humidification fluid may enter flow channel area 1112 from port 1138, and exit the flow channel area 1112 through the port 1148.
  • fluid flow plate 1100 is illustrated, for explanatory purposes, with four corners labeled A, B, C, and D. These labels will now be employed in describing an exemplary relative rotation among multiple instances of the fluid flow plate 1100, for advantage(s) such as enhanced design flexibility.
  • FIG. 13 multiple instances of fluid flow plate 1100 are illustrated with reference labels A, B, C, and D indicating an exemplary relative orientation among the fluid flow plates.
  • FIGS. 11-12 depict the multiple instances of apertures for entrance and exit of fluids at varying relative orientations among the multiple fluid flow plates.
  • FIG. 13 depicts two distinct orientations for fluid flow plate 1100.
  • Those skilled in the art will appreciate further orientation(s) and/or additional feature(s) for the fluid flow plates may be provided.
  • a description of use and reuse of various apertures and manifolds on different faces of the multiple instances of the fluid flow plate 1100 is now presented.
  • aperture 1114 on first instance 2200 of fluid flow plate 1100 forms a portion of fuel entrance manifold 1116, where port 1118 provides fluid communication between the entrance fuel manifold 1116 and flow channel area 1110.
  • the aperture 1114 on the first instance 2200 of the fluid flow plate 1100 has a first longitudinal axis of fuel cell assembly 100 passing therethrough.
  • the port 1118 on the first instance 2200 of the fluid flow plate 1100 has a second axis of the fuel cell assembly passing therethrough.
  • aperture 1102 of second instance 2510 of the fluid flow plate 1100 forms a portion of the entrance fuel manifold 1116 having the first longitudinal axis of the fuel cell assembly passing therethrough.
  • the second instance 2510 of the fluid flow plate 1100 can be considered as comprising entrance fuel manifold 1104 of the second instance 2510 of the fluid flow plate 1100. Furthermore, the second instance 2510 of the fluid flow plate 1100 lacks a port between the entrance fuel manifold 1116 and flow area 1110 on the second instance 2510 of the fluid flow plate 1100 through which the second longitudinal axis otherwise might pass. The second instance 2510 of the fluid flow plate 1100 would receive fuel from port 1118 into flow channel area 1110 at a location having yet a third longitudinal axis of the fuel cell assembly passing therethrough.
  • the port 1118 on the second instance 2510 of the fluid flow plate 1100 would occur at a location ninety degrees relatively, transversely, and rotationally offset from the port 1118 on the first instance 2200 of the fluid flow plate 1100, as will be appreciated by those skilled in the art.
  • the certain fluid manifold need not be as large as it would need to be in order to service the entire set of fluid flow plates in the fuel cell assembly. So, a certain aperture through a particular fluid flow plate forming a portion of the certain fluid manifold may be made smaller. For example, such a decrease in space consumption may allow addition and/or rearrangement of further feature(s) for the fluid flow plate and/or fuel cell assembly.
  • the decrease in space consumption may allow a local decrease in dimension for the fluid flow plate and/or the fuel cell assembly.
  • Similar advantage(s) may result with analogous multiplication for any type of fluid manifold and/or apertures therefor, including, for example, entrance, exit, fuel, oxidant, and/or humidification fluid manifolds and/or apertures therefor.
  • feature(s) characteristic(s) and/or advantage(s) of the fluid flow plates described herein in any exemplary embodiment may be applied and/or extended to any embodiment in accordance with the principles of the present invention.
  • flow channel(s) may be formed with variable cross section(s).
  • each of the plurality of flow channels is preferably formed having substantially the same length.
  • a given fluid flow plate of the present invention which conducts fluids on both faces might be configured so the fluids have, for example, parallel flow, counter flow, and/or perpendicular flow among various (e.g., generally serpentine) flow channels.
  • a parallel flow configuration might generally transversely align flow on the opposing faces by positioning corresponding first and second inlets at opposite sides of a first corner of the plate, and corresponding first and second outlets at opposite sides of a generally diametrically opposed second corner of the plate.
  • a counter flow design might provide flow in generally transversely opposite directions on the opposing faces by placing first inlet(s) and second outlet(s) at opposite sides of a first corner of the plate, and first outlet(s) and second inlet(s), respectively, at opposite sides of a generally diametrically opposed second corner of the plate.
  • perpendicular flow might entail flow channels on opposite sides of a plate oriented crosswise with respect to each other. Any variation(s), combination(s), and/or modification(s) of these concept(s) may be provided with any flow channel (s) and/or flow channel section(s).
  • Operation of a fuel cell assembly of the present invention can include periods or intervals of action and inaction, such as an active use followed by idling.
  • the fuel cell assembly can be employed for varied (e.g., automotive to aerospace to industrial to residential) applications, in various environments. Numerous alternative embodiments of the present invention exist.
  • Fluid flow plate 200 and/or fluid manifold(s) 150, 150' could serve any desired function with any appropriate orientation, shape, and/or formation in any position of fuel cell assembly 100.
  • fluid flow face 202 could easily have any number of flow channels 204. Any flow channel 204 could easily have any appropriate shape or structure.
  • flow channel(s) 204 could easily be configured to deviate, to any desired degree, from parallel alignment and/or serpentine design.
  • any of port(s) 206 and/or port(s) 208 might employ any mechanism for fluid communication between appropriate flow channel(s) 204 and fluid manifold(s) 150, 150'. Design choices permit variation in construction technique(s) and/or material(s) for any portion of fluid flow plate 200 and/or fuel cell assembly 100. Furthermore, fluid flow plate(s) 200 could easily be employed in any appropriate type(s) of fuel cell(s). Additionally, working section 114 could easily include any desired type(s) of fuel cell(s).

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Sustainable Energy (AREA)
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  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne un ensemble (100) pile à combustible comprenant une première plaque (200) de champ d'écoulement comportant un premier canal (204) d'écoulement. Le fluide est véhiculé vers le canal d'écoulement par un orifice (858) traversant la première plaque. Une seconde plaque adjacente (510) participe à la constitution d'une surface (508) destinée à un chemin d'écoulement (501) entre un collecteur (854) et l'orifice (858). Des surfaces supplémentaires (506, 512) peuvent permettre d'obtenir un chemin d'écoulement (501) et/ou un support structurel pour ledit chemin. Une formation (862) sur la première plaque (200) empêche toute communication fluidique à partir du collecteur (854) sur un côté (202) de la plaque comprenant le premier canal (204) d'écoulement. Cette formation peut servir de support structurel dans un ensemble (100) pile à combustible (de type à membrane électrolyte polymère par exemple), et/ou d'élément de serrage et/ou d'étanchéité pour un ensemble (310) électrode à membrane. De même, un second chemin d'écoulement permet d'assurer l'humidification du fluide (le réactif par exemple). Ce second chemin d'écoulement peut comporter des régulateurs d'écoulement et/ou des orifices (860) de dosage. La seconde plaque (510) peut comporter un second canal d'écoulement . Les chemins d'écoulement de la seconde plaque peuvent être configurés pour former la surface précitée (508) ou le chemin d'écoulement de la première plaque sans qu'il y ait d'interférences entre les fluides de service de chacune des plaques. En utilisant plusieurs des collecteurs pour un fluide, on peut envisager qu'un collecteur omette le service d'une plaque, puisqu'un collecteur différent assurera alors le service omis.
PCT/US1999/023283 1998-10-07 1999-10-06 Ensemble pile a combustible permettant une meilleure gestion du fluide de service et une plus grande flexibilite de conception WO2000021153A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19983649T DE19983649T1 (de) 1998-10-07 1999-10-06 Brennstoffzellenaufbaueinheit zur Förderung der Fluidversorgung und der Konstruktionsflexibilität
CA002346395A CA2346395A1 (fr) 1998-10-07 1999-10-06 Ensemble pile a combustible permettant une meilleure gestion du fluide de service et une plus grande flexibilite de conception
AU65097/99A AU6509799A (en) 1998-10-07 1999-10-06 Fuel cell assembly unit for promoting fluid service and design flexibility
JP2000575180A JP2002527862A (ja) 1998-10-07 1999-10-06 流体供給及び設計上の柔軟性を促す燃料電池集合体装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/167,359 US6174616B1 (en) 1998-10-07 1998-10-07 Fuel cell assembly unit for promoting fluid service and design flexibility
US09/167,359 1998-10-07

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WO2000021153A1 true WO2000021153A1 (fr) 2000-04-13

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JP (1) JP2002527862A (fr)
AU (1) AU6509799A (fr)
CA (1) CA2346395A1 (fr)
DE (1) DE19983649T1 (fr)
WO (1) WO2000021153A1 (fr)

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JP2002015751A (ja) * 2000-06-30 2002-01-18 Aisin Takaoka Ltd 燃料電池及びそのセパレータ
JP4558150B2 (ja) * 2000-06-30 2010-10-06 アイシン高丘株式会社 燃料電池及びそのセパレータ
JP2002252004A (ja) * 2001-02-15 2002-09-06 Asia Pacific Fuel Cell Technology Ltd 燃料電池用バイポーラー板
GB2409763A (en) * 2003-12-31 2005-07-06 Intelligent Energy Ltd Water management in fuel cells
GB2409763B (en) * 2003-12-31 2007-01-17 Intelligent Energy Ltd Water management in fuel cells
US8277998B2 (en) 2003-12-31 2012-10-02 Intelligent Energy Limited Water management in fuel cells
US8609288B2 (en) 2003-12-31 2013-12-17 Intelligent Energy Limited Water management in fuel cells

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US6500580B1 (en) 2002-12-31
DE19983649T1 (de) 2001-11-22
US6174616B1 (en) 2001-01-16
JP2002527862A (ja) 2002-08-27
CA2346395A1 (fr) 2000-04-13
AU6509799A (en) 2000-04-26

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